title: Role of preferential weak hybridization between the surface-state of a metal and the oxygen atom in the chemical adsorption mechanism.
abstract: We report on the chemical adsorption mechanism of atomic oxygen on the Pt(111) surface using angle-resolved-photoemission spectroscopy (ARPES) and density functional calculations. The detailed band structure of Pt(111) from ARPES reveals that most of the bands near the Fermi level are surface-states. By comparing band maps of Pt and O/Pt, we identify that dxz (dyz) and dz(2) orbitals are strongly correlated in the surface-states around the symmetry point M and K, respectively. Additionally, we demonstrate that the s- or p-orbital of oxygen atoms hybridizes preferentially with the dxz (dyz) orbital near the M symmetry point. This weak hybridization occurs with minimal charge transfer.
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: Yong Su
authors.initials: YS
authors.lastname: Kim
authors.forename: Sang Ho
authors.initials: SH
authors.lastname: Jeon
authors.forename: Aaron
authors.initials: A
authors.lastname: Bostwick
authors.forename: Eli
authors.initials: E
authors.lastname: Rotenberg
authors.forename: Philip N
authors.initials: PN
authors.lastname: Ross
authors.forename: Andrew L
authors.initials: AL
authors.lastname: Walter
authors.forename: Young Jun
authors.initials: YJ
authors.lastname: Chang
authors.forename: Vojislav R
authors.initials: VR
authors.lastname: Stamenkovic
authors.forename: Nenad M
authors.initials: NM
authors.lastname: Markovic
authors.forename: Tae Won
authors.initials: TW
authors.lastname: Noh
authors.forename: Seungwu
authors.initials: S
authors.lastname: Han
authors.forename: Bongjin Simon
authors.initials: BS
authors.lastname: Mun